Before coming to MIT to pursue a PhD in chemistry, Levi Knippel would spend hours after his workdays at Genentech, where he was an associate scientist, training with two world champion kickboxers. “It helped me break out of my shell,” he says of the sport. “This zen state of just me, my body, and my opponent trying to hurt me –– it’s like this chess match.” In the ring, he has a combined record of one win, one loss, and one draw. “Nice and balanced,” he says with a laugh….